Car Harkins on Instagram: "The Củ Chi Tunnels, located near Ho Chi Minh City, are a vast underground network built by the Viet Minh in the late 1940s and greatly expanded by the Viet Cong during the Vietnam War. Spanning over 250 km, the multi-level system included living areas, hospitals, kitchens, and command posts, all hidden beneath jungle cover and protected by booby traps. They enabled the Viet Cong to launch surprise attacks, store supplies, and survive intense U.S. bombing and search ope

Mack Hollins on Instagram: "Catacombs of Odessa 🕯️🕳️ #5Ws Beneath the streets in Ukraine lies one of the largest underground labyrinths on Earth. Over 1,500 miles of tunnels twist through darkness. Carved from limestone used to build the city above. During World War II, these tunnels became a hidden world of smugglers, outlaws, and resistance fighters. People have vanished inside, never to return. Maps don’t agree. Paths shift. Dead ends appear where none should be. The Catacombs of Odessa are

SoCal Outdoor Explorer on Instagram: "Over 100 years ago, miners cut this tunnel hoping to strike borax. Instead, the shaft flooded, the operation failed, and they locked the entrance with steel bars. The water was piped to their camp… and no one’s been inside ever since. So what do you think is still down there? 👀 Coordinates are in the link in bio."